RU223994U1 - Composite basalt material stud - Google Patents

Abstract

The utility model relates to the designs of fasteners such as studs and can be used for assembling threaded connections in mechanical engineering. A stud made of a composite basalt material, containing a threaded part up to the shoulder and a threaded part at the opposite end of the stud, a shoulder for stop, a hexagon and a cylindrical part, wherein the stud is made of a composite material including a basalt base in the form of a fiber, impregnated with binding resins, the hexagon is formed by a stamp from a heated workpiece, and the basalt base in the form of a fiber, impregnated with binding resins, is made with the addition of basalt fiber crumbs, previously uniformly mixed in the resin, and the length of the basalt fiber crumb cylinders is equal to the difference between the outer diameter of the stud thread and its inner diameter. The technical result of the utility model is to increase the stability of the threaded and edge connection of the stud by improving the rigidity of epoxy composites. 1 ill.

Description

Field of technology

The utility model relates to the designs of fasteners such as studs and can be used for assembling threaded connections in mechanical engineering.

State of the art

A bolt made of composite material is known (patent RU 214624 MPK E04S 5/12. Published: 11/08/2022 Bulletin No. 31), containing a hexagonal head and a rod with smooth and threaded parts, while the bolt is made of a composite material, including a basalt base in the form fibers impregnated with binding resins, the hexagonal head is formed by a stamp from a heated workpiece, and the basalt base in the form of fibers, impregnated with binding resins, is made with the addition of basalt powder, pre-mixed in the resin.

A disadvantage of the known device is the low stability of the threaded connection of the stud.

The closest known device is a stud made of composite basalt material (patent RU 219140 MPK F16B 35/04. Published: 06/30/2023 Bulletin No. 19), containing a threaded part up to the shoulder and a threaded part at the opposite end of the stud, a shoulder for stop, a hexagon and a cylindrical part, wherein the pin is made of a composite material, including a basalt base in the form of a fiber, impregnated with binding resins, the hexagon is formed by a stamp from a heated workpiece, characterized in that the basalt base in the form of a fiber, impregnated with binding resins, is made with the addition of basalt powder, previously uniformly mixed in resin.

A disadvantage of the known device is the low stability of the threaded connection of the stud.

Disclosure of utility model

The technical result of the utility model is to increase the stability of the threaded and edge connection of the stud by improving the rigidity of epoxy composites.

This technical result is achieved in a stud device made of composite basalt material, containing a threaded part up to the flange and a threaded part at the opposite end of the stud, a shoulder for stop, a hexagon and a cylindrical part, while the stud is made of a composite material including a basalt base in the form of a fiber, impregnated binder resins, the hexagon is formed by a stamp from a heated workpiece, and the basalt base in the form of a fiber, impregnated with binder resins, is made with the addition of crumbs of basalt fibers, previously evenly mixed in the resin, and the length of the cylinders of crumbs of basalt fibers is equal to the difference between the outer diameter of the stud thread and its inner diameter Distinctive features are a basalt base in the form of a fiber, impregnated with binding resins, made with the addition of basalt fiber crumbs, the use of such material increases the stability of the threaded connection by improving the rigidity of epoxy composites by combining basalt fibers with basalt fiber crumbs;

pre-uniform mixing of basalt fiber crumbs in the binder resin, this preserves the stability of the threaded and edge joints due to the rigidity of hybrid epoxy composites [3];

the length of the basalt fiber crumb cylinders is equal to the difference between the outer diameter of the stud thread and its inner diameter, which increases the stability of the stud threaded connection by improving the rigidity of epoxy composites.

A comparison of the proposed solution with analogues and a prototype did not allow us to identify in them the features that distinguish the proposed solution; this allows us to draw a conclusion about compliance with the “novelty” criterion.

Brief description of the drawing

The figure shows a frontal view of a stud impregnated with binding resins with the addition of basalt fiber crumbs, including: 1 - threaded part up to the collar; 2 - shoulder for stop; 3 - cylindrical part; 4 - hexagon, 5 - threaded part on the opposite end of the stud.

Implementation of a utility model

The main raw material for the production of basalt studs is basaltoroving. In addition, to make a composite pin, you need: resin; basaltoroving winding harness, which goes to winding the stud rod to create a bead; ethanol; acetone; dicyandiamide; crumb of basalt fiber cylinders obtained from basalt fiber by chopping roving in the form of a bundle in a chopping machine [4]. The length of the crumb cylinders depends on the feed speed of the fiber roving and the speed of lowering the knife. The technology for producing basalt hairpins is as follows. The roving threads from a special creel device enter the tension mechanism, in which they are arranged in the appropriate order. The threads arranged in a given order go through the stage of drying and preheating with hot air. The heated roving is immersed in an impregnation bath with resin, pre-evenly mixed with basalt fiber crumbs in a mixer. A continuous, composite rod is passed through a drawing mechanism, at the exit of which the rod is cut according to a given size. After the impregnation bath, the material is pulled through a die to obtain a stud body of the cylindrical part 3, a given cross-sectional area of the rod and its length, taking into account the formation of a hexagon 4 by a stamp from a heated workpiece at a distance below the thread. The profiling die can be made, for example, in the form of a detachable steel structure, consisting of two rectangles with a milled and grooved half-figure along the length of each part, which, when closed, form a surface in the form of a circle corresponding to the area of the target device.

When producing composite studs, a three-position automatic press is used. Hot stamping of hexagon 4 is performed in three positions of technological transitions. At the first stamping position, the workpiece is calibrated and the formation of a hexagon 4 begins. Starting from the second stamping position, the formation of a hexagon 4 with ribs and faces begins. At the third stamping position, the formation of the calibration rod for collar 2 in the stud blank is completed. To operate as a knurl, the rod is made along the average diameter of threads 1 and 5. The knurl has a intake cone with the same profile, when viewed from the end, and with the full height of the thread. The thread is made by knurling by extruding from both ends of the stud, while, randomly, half the length of the cylinders of crumbs of basalt fibers remains in the body of the stud, and the other half is formed in its thread, equal to the difference between the outer diameter of the stud thread and its internal diameter.

The prepared pin is sent to a tunnel oven designed to accelerate the polymerization process of impregnating resins. The hot pin is sent into a cooled bath, where it is completely cooled under running water. The cooled stud on the lathe undergoes calibration of threads 1 and 5 and the stop at the collar 2. In this case, the hexagon 4 is located between the cylindrical part 3 and the threaded part 5 at the opposite end.

The average uniaxial compressive strength of basalt in MPa is 160 [5], this increases the surface stability of the device.

The inventive pin made of composite basalt material increases the stability of the threaded and edge connections during its operation and eliminates their possible weakening.

Information sources

1. Patent RU 214624 MPK E04C 5/12. Published: 11/08/2022 Bulletin. No. 31;

2. Patent RU 219140 MPK F16B 35/04. Published: 06/30/2023 Bulletin. No. 19;

3. Hybrid effect of basalt fibers and basalt powder on the thermomechanical properties of epoxy composites. Composites Part B: Mechanical Engineering, Vol. 125, 2017, pp. 157-164;

4. Fiberglass chipping machine. https://oborudovanie.myprom.ru/product/rubochnaya-gilotina-dlya-vseh-tipov-volokon_95420;

5. Fundamentals of rock physics, geomechanics and rock mass control. Portsevsky A.K., Katkov G.A. UMO stamp (No. 51-73 dated June 28, 2004) Registered with the Federal Agency for Education (No. 5374 dated November 16, 2005), 120 pp. 21. https://yandex.ru/search/?text=%D1%84%D0%B8%D0%B7%D0%B8%D0%BA%D0%B0+%D0%B3%D0%BE%D1%80% D0%BD%D1%8B%D1%85+%D0%BF%D0%BE%D1%80%D0%BE%D0%B4+%D1%83%D1%87%D0%B5%D0%B1%D0 %BD%D0%B8%D0%BA+%D0%B4%D0%BB%D1%8F+%D0%B2%D1%83%D0%B7%D0%BE%D0%B2&clid=2233626&search_source=dzen_desktop_safe&src=suggest_Pers&lr=212153 .

Claims (1)

A stud made of composite basalt material, containing a threaded part up to the shoulder and a threaded part at the opposite end of the stud, a shoulder for stop, a hexagon and a cylindrical part, wherein the stud is made of a composite material including a basalt base in the form of a fiber, impregnated with binding resins, the hexagon is formed by a stamp from a heated workpiece, characterized in that the basalt base in the form of a fiber, impregnated with binding resins, is made with the addition of basalt fiber crumbs, previously uniformly mixed in the resin, and the length of the basalt fiber crumb cylinders is equal to the difference between the outer diameter of the stud thread and its inner diameter.